ApexManager: Use new submitStagedSession API

This is a minimum change required to merge another CL in this topic,
which will unblock merging it into AOSP.

Change-Id: Ic1a80191e7ef17fb2e11e2ca6e2140131ac08e50
Merged-In: I5ea596ea6417825845c16bbb6e26e9c13845139b
Bug: 136548037
Test: atest CtsStagedInstallHostTestCases

services/core/java/com/android/server/pm/ApexManager.java

@@ -312,10 +312,14 @@ class ApexManager {
             int sessionId, @NonNull int[] childSessionIds, @NonNull ApexInfoList apexInfoList) {
         if (!isApexSupported()) return false;
         try {
-            return mApexService.submitStagedSession(sessionId, childSessionIds, apexInfoList);
+            mApexService.submitStagedSession(sessionId, childSessionIds, apexInfoList);
+            return true;
         } catch (RemoteException re) {
             Slog.e(TAG, "Unable to contact apexservice", re);
             throw new RuntimeException(re);
+        } catch (Exception e) {
+            Slog.e(TAG, "apexd verification failed", e);
+            return false;
         }
     }